Wall board



Patented Feb. 10, 1925.

cnmEs n mrwsny, or HmsDA FJ,

rumors, AssIoNoR To UNI ED s'rarEs GYP- sum COMPANY, or CHICAGO,ILtINoIs, a ConronArron or ItLINoIs. I,

" WALL BOARD.

lpplicationflled October 10, 1921. Serial. No. 506,675.

To all to/m it may concern a Beitknown that I, CHARLES'R. BInnsEY,

' tion is illustrated State of Illinois,

ed es oft a citizen of the Hinsdale, in the have invented" new andImprovements in ,Wall Boards, of which the following is a specification.

The invention relates to improvements in wallboards and moreparticularly to a wallboard made of plaster with a paper covermg.

A distinction has arisen in the trade whereby the term wallboard isapplied to prepared board that can be secured in place in a building andits surface is ready to paper or paint without any other coating, whilethe term plaster-board is applied to a prepared board that is secured tothe studding in the place of laths and presents a surface to receiveplaster beforeit is painted or papered.

It is an, object of this invention to provide a wallboard the body ofwhich is a comuseful position, preferably plaster, covered on each sldewith cover sheets, preferably and in so constructing the longitudinaledges of the wallboard that the composition body during manufacture willbe retained directly to the edges at a uniform thickness throughout andthe cover sheets adjacent the edges so reinforced as to maintain a fullstraight edge of uniform thickness during transportation and upon aplication, allowing wallboards to be placed edge to edge uninterruptedby any nailed in such position without disruptin the plaster bodybetween the coverings at t e edges.

, While the preferred form of this invenupon the accompanying sheet ofdrawing, yet it is to be understood that minor detail changes may bemade without departing from the scope thereof.

In the drawing:

Figure 1 is a view in cross-section, with parts broken awa illustratingthe construction of the ongitudinal edges of a form of this invention. 1

Figure 2 is a perspective view of Figure 1 illustratin the longitudinaland transverse is improved form of wallboard; igure 3 is a detailed viewin cross-section illustrating a modified form of edge construct'ed inaccordance with this invention. Figure4 is a perspective view of Figure"which the composition with a 1121 edge thereof formed 3 illustratingthe longitudinal 'and transg I Verse edges of, this form of wallboard.UnitedStates, residing at county, of Du Page and l Vallboard ofthisgeneral type is usually through whichis fed a wide strip ofpaperwhich forms the bottom covering upon is automatically spread and asimilar strip of paper forming the upper sheetis fed thereover, the twocover sheets with the composition body between them passing out of themachine between ,rollers that impart a uniform thickness to the'wallboard.

, This invention contemplates turning back upon itself, eachlongitudinal edge of each cover sheet so that the ends'are on the insideand the sheets of uniform width.

As shown on the drawing, 1 is the under or bottom cover sheet and 2 theupper or top cover sheet, 33 are the bent back rtions of thelongitudinal edges of the bottom sheet and 4-4 the bent back edges ofthe upper sheet. This construction gives the cover sheets rigidity tomaintain the body 5 continuously to the edge 6 of the wallboard on eachside during fabrication,

holds the body firmly between them and is reinforced so as to protectand keep in- 1 rupting the plaster at the edges.

If desired, while in course of manufacture, a cover strip, preferably ofpaper, 7 may be fed in between the cover sheets 1 and 2 along theexterior of the edges of the body. This strip will become attached tothe composition body, form an additional assurance that the body 5 willcontinue uninterrupted to the edge, and will form an additionalprotection to the edge during fabrication, transportation andapplication. What I claim is:

I. A wallboard having a plaster com osition body and upper and lowercover s eets reinforcement alon each longitudiy turning back constructedcontinuously in, a machine,v

the edges of the cover sheets upon themselves.

2. A wallboard having a rigid composition body and upper and lower coversheets.

4. A wallboard having a rigid composii tion body and upper andlowercover sheets with reinforcements alon each of the longitudinal edgesthereof, ormed by turning back the edges of the cover sheets u onthemselves onthe interior and imbeddmg the turned back edges in thebody.

5. A wallboard having a composition body and upper and lower coversheets with reinforcements along the longitudinal edges thereof, formedby turning back the edges of the cover sheets u on themselves on theinterior, imbedding t e turned back edges in the body, and a cover stripattached to the plastic body between the opposite longitudinal edges ofthe cover sheets.

CHARLES R. BIRDSEY.

